Flight number record
AS 339
Alaska Airlines · Austin to Seattle
- Route
- AUS → SEA
- Departs
- 19:07
- Flights
- 292
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 339, check with Alaska Airlines.
AS 339 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land about 45 minutes behind schedule. That rests on 292 flights, with a median arrival 5 minutes early.
Key figures
On time
74.5%
Arrivals under 15 minutes late, of 290 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.68%
National rate is 1.89%
1 hour+ late
5.5%
National rate is 8.3%
These figures cover 292 flights between September 2025 and August 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When AS 339 flies
AS 339 flies AUS to SEA without a single fixed slot. Its most common scheduled departure was 19:07, used on 83 of 292 flights, with 19:04 (46 flights) and 19:00 (33 flights) next.
- Departs 19:0783 flights28.4%
- Departs 19:0446 flights15.8%
- Departs 19:0033 flights11.3%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 19:07 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 339 runs 7 points better at 74.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 339 next to AUS to SEA
Every carrier on AUS to SEA combined arrived on time 81.3% of the time across 2,089 flights, so AS 339 is 7 points behind it. Alaska flew 1,051 flights on the same city pair under all its flight numbers, including this one, and those ran 81.8% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 339thin sample | 292 | 74.5% | 46 min | 0.68% | C+ |
| All Alaska Airlines on AUS–SEA | 1,051 | 81.8% | 50 min | 0.76% | B+ |
| All carriers on AUS–SEA | 2,089 | 81.3% | 61 min | 0.86% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 339 quarter by quarter
AS 339 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.7% on time and its weakest Jul–Sep 2026 at 66.1%, a swing of 20 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202521 flights—
- Oct–Dec 202583 flights75.6%
- Jan–Mar 202669 flights72.5%
- Apr–Jun 202657 flights85.7%
- Jul–Sep 202662 flights66.1%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, AS 339 did best on Saturday at 86.7% on time and worst on Tuesday at 68.6%. Each day rests on about 42 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 339 runs when it is late
AS 339 often beats the schedule: 75 of 290 completed flights, 26%, arrived 15 minutes or more early. The 74 late arrivals split 34 under half an hour, 24 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early75 flights25.9%
- Within 15 min141 flights48.6%
- 15–29 min late34 flights11.7%
- 30–59 min late24 flights8.3%
- 1–2 hours late12 flights4.1%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 290 completed flights by arrival against schedule.
A late pushback is often recovered here: of 75 departures that left 15 minutes late or more, 25 still arrived on time. In the other direction, 24 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for AS 339
The latest arrival of the period was on 9 February 2026, 3 hours 35 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 February 2026 | 3 hours 35 minutes | Late-arriving aircraft |
| 28 December 2025 | 3 hours 16 minutes | Late-arriving aircraft |
| 26 January 2026 | 2 hours 35 minutes | Late-arriving aircraft |
| 13 March 2026 | 2 hours 29 minutes | Late-arriving aircraft |
| 28 November 2025 | 1 hour 50 minutes | Late-arriving aircraft |
Delay causes
Why AS 339 runs late
Late-arriving aircraft accounts for 62% of the 3,366 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Late-arriving aircraft
- 27%National Airspace System
- 7%Carrier
- 2%Extreme weather
- 2%Security
62% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,366 reported delay minutes here, that single category outweighs weather by 27 to one. The split is drawn from 3,366 delay minutes reported on AS 339.
Cancellations are rare at 0.68%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
5.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 45 minutes, which a normal layover absorbs.
At 1,770 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on one other city pair in the data, including SJC to HNL (27), but none flew often enough under AS 339 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to AUS to SEA only.
One caution: this is a thin sample. 292 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking AS 339
For a booking, AS 339 is one of the weaker ways to fly AUS to SEA: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- AUS to SEA, every carrier and departure
- SEA to AUS, the return direction
- Alaska Airlines 503 on the same route84.0%
- Delta Air Lines 780 on the same route92.9%
- Austin-Bergstrom International (AUS) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.